Haha, looks like I fell down a pretty good rabbit hole! Great company by the looks of things Hi Denovich, Chaotix, Brainstorm, and everyone else. @Jtwalkz, glad you like the frame.
I like the look of the 2.5" 2S class for multigp, it makes sense and they will be quick. I prefer 2S in this size quad as it seems to keep the quad more agile, I do know of others that prefer 3S though.
I'm experimenting with a carbon fibre tube frame for 1104/5/6 and 2S at the moment. Recently I have been making larger quad frames with CF tubes and thought it might translate well to a smaller size, the results so far are very encouraging, the narrow arms seem to have an advantage over flat plate frames. I made one using some beat up DYS 1104 6500kv motors and the speed and acceleration was surprising. The 2nd and 3rd frames are being planned so I'll keep you all updated. The downside is the tube frames take a bit of time to put together, not that much though. I guess the benchmark motor to compare others against (for 2.5" 2S) would be the DYS 1104 6500kv or RotorX 1105B 6500kv. I measured the stator on a DYS 1104 6500kv and it appeared to be approx 4.8mm. Maybe that is why I could never feel any noticeable power difference between 1104's and 1105's. I never tried DYS 1104 7000kv as the current draw seemed to increase a lot for little thrust gain (in the given data) and I've really heard no reports from owners either.
With the 2.5" class, I guess its going to be a matter of first choosing a prop and a motor that work best together, and then selecting the rest of the components to make the lightest possible quad that can handle crashes without breaking too easily. At the moment there isn't much prop choice in 2.5", I've been fairly happy with the RX2535 in 2-blade config so far, and they are light. I also see the Walkera Rodeo 110 has a 3-blade 70mm (2.75") prop that might be useful, but expensive too (Edit - received some Walkera props but the bolt holes are at 5.5mm instead of 5mm, not really useful). Plus any 3" prop that can be cut down is a contender too.
FPVimpossible, be interested to hear any motor developments and other ideas you have as they develop, thanks for posting this thread.